Classification
380 - Commerce, communications & transportation
630 - Agriculture & related technologies
109
333 - Economics of land & energy
77
610 - Medicine & health
68
363 - Other social problems & services
67
000 - Computer science, information & general works
52
330 - Economics
47
700 - The arts; fine & decorative arts
46
600 - Technology
33
140 - Specific philosophical schools
27
580 - Plants (Botany)
27
320 - Political science
25
551 - Geology, hydrology & meteorology
22
620 - Engineering & allied operations
21
370 - Education
16
658 - General management
14
576 - Genetics & evolution
13
340 - Law
11
581 - Specific topics in natural history
10
900 - History & geography
8
500 - Natural sciences & mathematics
7
540 - Chemistry & allied sciences
7
361 - Social problems & social welfare in general
6
612 - Human physiology
6
615 - Pharmacology & therapeutics
6
800 - Literature & rhetoric
6
300 - Social sciences
5
414 - Phonology & phonetics
5
720 - Architecture
5
304 - Factors affecting social behavior
4
400 - Language
3
530 - Physics
3
100 - Philosophy & psychology
2
170 - Ethics
2
200 - Religion
2
657 - Accounting
2
791 - Public performances
2
301 - Sociology & anthropology
1
336 - Public finance
1
394 - General customs
1
410 - Linguistics
1